package com.syt.cart.interceptor;

import com.syt.cart.vo.UserInfoTo;
import com.syt.common.constant.AuthServerConstant;
import com.syt.common.constant.CartConstant;
import com.syt.common.vo.MemberResoVo;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * 在执行目标方法之前,判断用户的登录状态.并封装传递给controller目标请求
 */
@Component
public class CartInterceptor implements HandlerInterceptor {
    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();

    /**
     * 目标方法执行之前
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        HttpSession session = request.getSession();
        UserInfoTo userInfoVo = new UserInfoTo();
        MemberResoVo member = (MemberResoVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        if (member != null) {
            //用户登录
            userInfoVo.setUserId(member.getId());
        }
        Cookie[] cookies = request.getCookies();
        if (cookies != null && cookies.length > 0) {
            for (Cookie cookie : cookies) {
                String name = cookie.getName();
                if (name.equals(CartConstant.TEMP_USER_COOKIE_NAME)) {
                    userInfoVo.setUserKey(cookie.getValue());
                    userInfoVo.setTempUser(true);
                }
            }
        }
        //如果没有临时用户一定要分配一个用户
        if (StringUtils.isEmpty(userInfoVo.getUserKey())) {
            String uuid = UUID.randomUUID().toString();
            userInfoVo.setUserKey(uuid);
        }
        //目标方法执行之前
        threadLocal.set(userInfoVo);
        return true;
    }

    /**
     * 业务执行之后;分配临时用户,让浏览器保存
     *
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = threadLocal.get();
        //如果没有临时用户一定保存一个临时用户
        if (userInfoTo.isTempUser()) {
            //持续的延迟过期时间
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
            cookie.setDomain("mall.com");
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
        }
    }
}
